Method and apparatus for transmitting control information from relay node on backhaul uplink

ABSTRACT

According to one embodiment of the present invention, the method for transmitting control information from a relay node to a base station on a backhaul link comprises the steps of: determining whether one time slot of a backhaul uplink subframe from the relay node to the base station is a first type slot having transmitted symbol with guard time set or a second type slot without guard time set; diffusing the control information in a time domain using a first length sequence for the first type slot or a second length sequence for the second type slot; mapping the diffused control information on at least one slot from the first type slot or the second type slot; and transmitting the backhaul uplink subframe having more than one slot from the first type slot or the second type slot wherein the control information is mapped.

This Application is a 35 U.S.C. §371 National Stage Entry ofInternational Application No.: PCT/KR2010/003474, filed on May 31, 2010,which claims the benefit of priority to U.S. Provisional ApplicationNos. 61/182,112, filed May 29, 2009, 61/185,964, filed Jun. 10, 2009 and61/262,127, filed Nov. 17, 2009, all of which are hereby incorporated byreference in their entirety for all purposes as if fully set forthherein.

TECHNICAL FIELD

The present invention relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting controlinformation in a relay node backhaul uplink.

BACKGROUND ART

FIG. 1 shows a relay node (RN) 120, a user equipment (UE) 131 and a userequipment (UE) 132 within an area of a base station (eNodeB: eNB) 110 ina wireless communication system 100. The relay node 120 may deliver datareceived from the base station 110 to the user equipment 132 within arelay node area and may deliver data received from the user equipment132 within the relay node area to the base station 110. The relay node120 may extend a fast data rate area raise communication quality on acell edge, and support a communication to be provided to an inside of abuilding or an area out of a base station service area. Referring toFIG. 1, such a user equipment (hereinafter named Macro-UE) directlyreceiving a service from the base station as a user equipment 131 andsuch a user equipment (hereinafter named Relay-UE) receiving a servicefrom the relay node 120 as a user equipment 132 may coexist.

FIG. 2 shows links among a base station, a relay node and a userequipment. The relay node may be connected with the base station via aninterface Un by wireless. And, a radio link between the base station andthe relay node is called a backhaul link. And, a link from the basestation to the relay node is called a backhaul downlink. Moreover, alink from the relay node to the base station is called a backhauluplink. The relay node may be connected to a user equipment via aninterface Uu by wireless and a radio link between the relay node and theuser equipment is called an access link. A link from the relay node tothe user equipment is called an access downlink and a link from the userequipment to the relay node is called an access uplink. If a backhaullink operates on a same frequency band of an access link, it can becalled ‘in-band’. If a backhaul link and an access link operate ondifferent frequency bands, respectively, it can be called ‘out-band’.

Via a backhaul link from a relay node to a base station, it may benecessary to transmit such physical layer control information asscheduling request (SR), downlink channel measurement information,acknowledgement/negative-acknowledgement (ACK/NACK) for downlink datatransmission and the like. Yet, a method of transmitting theabove-mentioned backhaul uplink physical layer control information hasnot been determined in detail.

DISCLOSURE OF THE INVENTION Technical Task

The technical task of the present invention is to provide a method oftransmitting control informations to a base station from a relay nodevia a backhaul uplink.

Technical Solution

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, a method oftransmitting backhaul uplink control information, which is transmittedfrom a relay node to a base station, according to one embodiment of thepresent invention may include the steps of determining whether one timeslot of a backhaul uplink subframe from the relay node to the basestation is a 1^(st) type slot including a transmission symbol having aguard time set therefor or a 2^(nd) type slot having no guard time settherefore, spreading the control information in time domain using asequence of a 1^(st) length for the 1^(st) type slot or a sequence of a2^(nd) length for the 2^(nd) type slot, mapping the spread controlinformation to at least one of the 1^(st) type slot and the 2^(nd) typeslot, and transmitting the backhaul uplink subframe including the atleast one of the control information mapped 1^(st) type slot and thecontrol information mapped 2^(nd) type slot.

Preferably, the sequence of the 1^(st) length may be generated bypuncturing sequence element(s) corresponding to the number oftransmission symbols having the guard time set therefor in the sequenceof the 2^(nd) length.

Preferably, the method may further include the steps of determiningwhether the one time slot of the backhaul uplink subframe includes asounding reference signal (SRS) transmission symbol and if the time slotincludes the sounding reference signal transmission symbol, puncturingsequence element(s) corresponding to the number of the soundingreference signal transmission symbols in the sequence of the 1^(st)length and the sequence of the 2^(nd) length, wherein the spreading stepmay be performed using the sequence punctured in the puncturing step.

Preferably, in accordance with an increase of a bit-width of the controlinformation, the control information may be modulated using either aphase or an amplitude or multiplexed on the basis of a slot.

Preferably, the control information may be transmitted by a transmissionperiod based on HARQ (hybrid automatic repeat request) timing of abackhaul uplink and a backhaul downlink.

More preferably, the control information may be transmitted by a periodamounting to an integer (1 included) multiple of 10 ms or 40 ms.

Preferably, the control information may include at least one selectedfrom the group consisting of a scheduling request, a backhaul downlinkchannel measurement information and ACK/NACK for a downlink datatransmission.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, a relay node, which transmits backhauluplink control information to a base station, according to anotherembodiment of the present invention may include a 1^(st) receivingmodule receiving backhaul downlink control information and data from thebase station, a 1^(st) transmitting module transmitting the backhauluplink control information and data to the base station, a 2^(rd)receiving module receiving access uplink control information and datafrom a user equipment, a 2^(nd) transmitting module transmitting accessdownlink control information and data to the user equipment, and aprocessor connected with the 1^(st) receiving module, the 2^(nd)receiving module, the 1^(st) transmitting module and the 2^(nd)transmitting module, the processor controlling the relay node includingthe 1^(st) receiving module, the 2^(nd) receiving module, the 1^(st)transmitting module and the 2^(nd) transmitting module, the processorincluding a determining module determining whether one time slot of abackhaul uplink subframe transmitted via the 1^(st) transmitting moduleis a 1^(st) type slot including a transmission symbol having a guardtime set therefor or a 2^(nd) type slot having no guard time settherefore, a spreading module spreading the backhaul uplink controlinformation in time domain using a sequence of a 1^(st) length for the1^(st) type slot or a sequence of a 2^(nd) length for the 2^(nd) typeslot, and a mapping module mapping the spread backhaul uplink controlinformation to at least one of the 1^(st) type slot and the 2^(nd) typeslot, wherein the processor may control the 1^(st) transmitting moduleto transmit the backhaul uplink subframe including the at least one ofthe backhaul uplink control information mapped 1^(st) type slot and thebackhaul uplink control information matted mapped 2^(nd) type slot.

Preferably, the processor may be further configured to generate thesequence of the 1^(st) length by puncturing sequence element(s)corresponding to the number of transmission symbols having the guardtime set therefor in the sequence of the 2^(nd) length.

Preferably, the determining module may be further configured todetermine whether the one time slot of the backhaul uplink subframeincludes a sounding reference signal (SRS) transmission symbol. If thetime slot includes the sounding reference signal transmission symbol,the processor may be further configured to puncture sequence element(s)corresponding to the number of the sounding reference signaltransmission symbols in the sequence of the 1^(st) length and thesequence of the 2^(nd) length. And, the punctured sequence may be usedby the spreading module.

Preferably, in accordance with an increase of a bit-width of the controlinformation, the processor may be further configured to modulate thebackhaul uplink control information using either a phase or an amplitudeor multiplex the backhaul uplink control information on the basis of aslot.

Preferably, the processor may control the 1^(st) transmitting module totransmit the backhaul uplink control information by a transmissionperiod based on HARQ (hybrid automatic repeat request) timing of abackhaul uplink and a backhaul downlink.

More preferably, the processor may control the 1^(st) transmittingmodule to transmit the backhaul uplink control information by a periodamounting to an integer (1 included) multiple of 10 ms or 40 ms.

Preferably, the backhaul uplink control information may include at leastone selected from the group consisting of a scheduling request, abackhaul downlink channel measurement information and ACK/NACK for adownlink data transmission.

The above-mentioned general description of the present invention and thefollowing details of the present invention are exemplary and may beprovided for the additional description of the invention disclosed inclaims.

Advantageous Effects

According to the present invention, when control informations aretransmitted to a base station from a relay node in backhaul uplink, anefficient signaling scheme is provided in consideration of a symbolstructure of a backhaul uplink subframe and types of controlinformations.

Effects obtainable from the present invention are non-limited by theabove mentioned effect. And, other unmentioned effects can be clearlyunderstood from the following description by those having ordinary skillin the technical field to which the present invention pertains.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention.

FIG. 1 is a diagram of a wireless communication system including a basestation, a relay node and user equipments.

FIG. 2 is a diagram to describe links among a base station, a relay nodeand a user equipment.

FIG. 3 is a diagram for a structure of a radio frame used by 3GPP LTEsystem.

FIG. 4 is a diagram of a resource grid in a downlink slot.

FIG. 5 is a diagram for a structure of a downlink (DL) subframe.

FIG. 6 is a diagram for an uplink (UL) subframe.

FIG. 7 is a diagram for a resource mapping structure of PUCCH in anuplink (UL) physical resource block.

FIG. 8 is a diagram for a structure of a channel of ACK/NACK informationon one slot.

FIG. 9 is a diagram of a resource mapping structure in case of applyinga shortened ACK/NACK format.

FIG. 10 is a diagram for a structure of a channel of a schedulingrequest for one slot.

FIG. 11 is a diagram of a resource allocation structure for asimultaneous transmission of ACK/NACK information and a schedulingrequest.

FIG. 12 is a diagram for a channel structure of CQI information bit forone slot.

FIG. 13 is a diagram of a channel structure related to a simultaneoustransmission of CQI information and ACK/NACK information.

FIG. 14 is a diagram of backhaul uplink transmission and access uplinkreception subframe structures of a relay node.

FIG. 15 is a diagram of PUCCH channel structure in a backhaul uplinksubframe.

FIG. 16 is a diagram for a guard time according to a backhaul uplinksetting.

FIG. 17 is a diagram for a structure of mapping control information toPUSCH resource.

FIG. 18 is a diagram of a wireless communication system including arelay node, a base station device and a user equipment device accordingto one preferred embodiment of the present invention.

BEST MODE FOR INVENTION

First of all, the following embodiments correspond to combinations ofelements and features of the present invention in prescribed forms. And,the respective elements or features may be considered as selectiveunless they are explicitly mentioned. Each of the elements or featurescan be implemented in a form failing to be combined with other elementsor features. Moreover, an embodiment of the present invention may beimplemented by combining elements and/or features together in part. Asequence of operations explained for each embodiment of the presentinvention may be modifiable. Some configurations or features of oneembodiment may be included in another embodiment or substituted withcorresponding configurations or features of another embodiment.

In this disclosure, embodiments of the present invention are describedcentering on the data transmission/reception relations between a basestation and a terminal. In this case, the base station may be meaningfulas a terminal node of a network which directly performs communicationwith the terminal. In this disclosure, a specific operation explained asperformed by a base station may be performed by an upper node of thebase station in some cases.

In particular, in a network constructed with a plurality of networknodes including a base station, it is apparent that various operationsperformed for communication with a terminal can be performed by a basestation or other networks except the base station. ‘Base station (BS)’may be substituted with such a terminology as a fixed station, a Node B,an eNode B (eNB), an access point (AP) and the like. A relay may besubstituted with such a terminology as a relay node (RN), a relaystation (RS) and the like. And, ‘terminal’may be substituted with such aterminology as a user equipment (UE), a mobile station (MS), a mobilesubscriber station (MSS), a subscriber station (SS) and the like.

In the following description, specific terminologies used forembodiments of the present invention are provided to help theunderstanding of the present invention. And, the use of the specificterminology may be modified into another form within the scope of thetechnical idea of the present invention.

Occasionally, to prevent the present invention from getting vaguer,structures and/or devices known to the public may be skipped orrepresented as block diagrams centering on the core functions of thestructures and/or devices. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like partsin this specification.

Embodiments of the present invention may be supported by the disclosedstandard documents of at least one of wireless access systems includingIEEE 802 system, 3GPP system, 3GPP LTE and LTE-A (LTE-Advanced) systemand 3GPP2 system. In particular, the steps or parts, which are notexplained to clearly reveal the technical idea of the present invention,in the embodiments of the present invention may be supported by theabove documents. Moreover, all terminologies disclosed in this documentmay be supported by the above standard documents.

The following description of embodiments of the present invention may beusable for various wireless access systems including CDMA (code divisionmultiple access), FDMA (frequency division multiple access), TDMA (timedivision multiple access), OFDMA (orthogonal frequency division multipleaccess), SC-FDMA (single carrier frequency division multiple access) andthe like. CDMA can be implemented with such a radio technology as UTRA(universal terrestrial radio access), CDMA 2000 and the like. TDMA canbe implemented with such a radio technology as GSM/GPRS/EDGE (GlobalSystem for Mobile communications)/General Packet Radio Service/EnhancedData Rates for GSM Evolution). OFDMA can be implemented with such aradio technology as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, E-UTRA (Evolved UTRA), etc. UTRA is a part of UMTS (UniversalMobile Telecommunications System). 3GPP (3rd Generation PartnershipProject) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS)that uses E-UTRA. The 3GPP LTE adopts OFDMA in downlink (hereinafterabbreviated) DL and SC-FDMA in uplink (hereinafter abbreviated UL). And,LTE-A (LTE-Advanced) is an evolved version of 3GPP LTE. WiMAX may beexplained by IEEE 802.16e standard (e.g., WirelessMAN-OFDMA referencesystem) and advanced IEEE 802.16m standard (e.g., WirelessMAN-OFDMAadvanced system). For clarity, the following description mainly concerns3GPP LTE system or 3GPP LTE-A system, by which the technical idea of thepresent invention may be non-limited.

FIG. 3 is a diagram for a structure of a radio frame used by 3GPP LTEsystem. A radio frame includes 10 subframes. Each of the subframesincludes 2 slots in time domain. And, a time taken to transmit onesubframe is defined as a transmission time interval (hereinafterabbreviated TTI). For instance, one subframe can have a length of 1 msand one slot can have a length of 0.5 ms. One slot may include aplurality of OFDM symbols in time domain. Since 3GPP LTE system usesOFDMA scheme in DL, the OFDM symbol indicates one symbol length(period). And, one symbol may be called SC-FDMA symbol or symbol period.A resource block (hereinafter abbreviated RB) is a resource allocationunit and includes a plurality of contiguous subcarriers in one slot. Thestructure of the radio frame shown in the drawing is exemplary.Optionally, the number of subframes included in one radio frame, thenumber of slots included in one subframe, or the number of symbolsincluded in one slot may be modifiable in various ways.

FIG. 4 is a diagram of a resource grid in DL slot. Referring to FIG. 4,one DL slot may include 7 OFDM symbols in time domain and one resourceblock (RB) may include 12 subcarriers in frequency domain, by which thepresent invention may be non-limited. For instance, in case of a normalCP (cyclic prefix), one slot may include 7 OFDM symbols. In case of anextended CP, one slot may include 6 OFDM symbols. Each element on aresource grid may be named a resource element (hereinafter abbreviatedRE). One resource block may include 12×7 resource elements. The numberN^(DL) of resource blocks included in a DL slot may depend on a DLtransmission bandwidth. A structure of a UL slot may be identical tothat of the DL slot.

FIG. 5 is a diagram for a structure of a downlink (DL) subframe. Maximum3 OFDM symbols situated in a head part of a first slot of one subframecorrespond to a control region to which a control channel is allocated.The rest of OFDM symbols correspond to a data region to which PDSCH(physical downlink shared channel) is allocated. Examples of a DLcontrol channel used by 3GPP LTE system may include PCFICH (PhysicalControl Format Indicator Channel), PDCCH (Physical Downlink ControlChannel), PHICH (Physical hybrid automatic repeat request indicatorChannel) and the like. The PCFICH is transmitted in a first OFDM symbolof a subframe and includes information on the number of OFDM symbolsused for a transmission of a control channel within the subframe. ThePHICH includes HARQ ACK/NACK signal in response to a UL transmission.Control information carried on PDCCH may be called downlink controlinformation (DCI). The DCI may include UL or DL scheduling informationor a UL transmission power control command for a random UE (userequipment) group. The PDCCH may include transmission format and resourceallocation information of DL-SCH (downlink shared channel), resourceallocation information on UL-SCH (uplink shared channel), paginginformation on PCH (paging channel), system information on DL-SCH,resource allocation of such an upper layer control message as a randomaccess response transmitted on PDSCH, transmission power control commandset for individual UEs within a random UE group, transmission powercontrol information, activation of VoIP (voice over IP) and the like. Aplurality of PDCCHs can be transmitted within the control region. A userequipment may be able to monitor a plurality of the PDCCHs. The PDCCH istransmitted as an aggregation of at least one or more contiguous CCEs(control channel elements). The CCE is a logical allocation unit used toprovide the PDCCH at a coding rate based on a radio channel status. TheCCE may correspond to a plurality of REGs (resource element groups). Aformat of the PDCCH and the number of available PDCCH bits may bedetermined in accordance with correlation between the number of CCEs anda coding rate provided by the CCE. A base station determines a PDCCHformat in accordance with a DCI which is to be transmitted to a userequipment and attaches a CRC (cyclic redundancy check) to controlinformation. The CRC is masked with an identifier named RNTI (radionetwork temporary identifier) in accordance with an owner or usage ofthe PDCCH. For instance, if the PDCCH is provided for a specific userequipment, the CRC may be masked with an identifier (e.g., cell-RNTI(C-RNTI)) of the corresponding user equipment. In case that the PDCCH isprovided for a paging message, the CRC may be masked with a pagingindicator identifier (e.g., P-RNTI). If the PDCCH is provided for systeminformation (particularly, for a system information block (SIC)), theCRC may be masked with a system information identifier and a systeminformation RNTI (SI-RNTI). In order to indicate a random accessresponse for a transmission of a random access preamble of a userequipment, the CRC may be masked with RA-RNTI (random access-RNTI).

FIG. 6 is a diagram for an uplink (UL) subframe. A UL subframe may bedivided into a control region and a data region in frequency domain. Aphysical UL control channel (PUCCH) including UL control information maybe allocated to the control region. And, a physical UL shared channel(PUSCH) including user data may be allocated to the data region. Inorder to maintain single carrier property, one user equipment does nottransmit PUCCH and PUSCH simultaneously. PUCCH for one user equipmentmay be allocated to a resource block pair (RB pair). Resource blocksbelonging to the resource block pair may occupy different subcarriersfor 2 slots. Namely, a resource block pair allocated to PUCCH isfrequency-hopped on a slot boundary.

In the following description, a physical UL control channel (PUCCH)including UL control information may be explained in detail.

First of all, it may be able to modulate PUCCH using BPSK (binary phaseshift keying) and QPSK (quadrature phase shift keying). Controlinformation of a plurality of user equipments may be transmitted onPUCCH. If CDM (code division multiplexing) is performed to identify asignal of each of the user equipments, a CAZAC (constant amplitude zeroautocorrelation) sequence having a length of 12 may be mainly used. Sinethe CAZAC sequence is characterized in maintaining a predeterminedamplitude in time and frequency domains, it has a property suitable forraising a coverage by lowering PAPR (peak-to-average power ratio) of auser equipment. Moreover, ACK/NACK information on a DL data transmissionon PUCCH may be covered using an orthogonal sequence.

Control information carried on PUCCH may be identified using acyclically shifted sequence having a different cyclic shift value. Itmay be able to generate the cyclically shifted sequence in a manner ofcyclically shifting a base sequence as many as a specific CS (cyclicshift) amount. In this case, the specific CS amount may be indicated bya cyclic shift (CS) index. The number of available cyclic shifts mayvary in accordance with a delay spread of a channel. Various kinds ofsequences may be usable as a base sequence. And, the aforesaid CAZACsequence may be one example of the base sequence.

PUCCH may include such control information as scheduling request (SR),DL channel measurement information, ACK/NACK information on DL datatransmission and the like. Channel measurement information may include achannel quality indicator (CQI), a precoding matrix index (PMI) and arank indicator (RI).

In accordance with a type of control information included in PUCCH, amodulation scheme and the like, PUCCH format may be defined. Inparticular, PUCCH format 1 is used for a transmission of SR, PUCCHformat 1a or PUCCH format 1b is used for a transmission of HARQACK/NACK, PUCCH format 2 is used for a transmission of CQI, and PUCCHformat 2a/2b is used for a transmission of CQI and HARQ ACK/NACK.

In case that HARQ ACK/NACK is singly transmitted in a random subframe,PUCCH format 1a or PUCCH format 1b may be used. In case that SR issingly transmitted in a random subframe, PUCCH format 1 may be used. Auser equipment may be ale to transmit HARQ ACK/NACK and SR in a samesubframe. This shall be described later.

PUCCH format may be summarized into Table 1.

TABLE 1 Number of PUCCH Modulation bits per format scheme subframe Usageetc. 1 N/A N/A SR(Scheduling Request) 1a BPSK 1 ACK/NACK One codeword 1bQPSK 2 ACK/NACK Two codeword 2 QPSK 20 CQI Joint Coding ACK/NACK(extended CP) 2a QPSK + BPSK 21 CQI + ACK/ Normal CP only NACK 2b QPSK +BPSK 22 CQI + ACK/ Normal CP only NACK

FIG. 7 shows a resource mapping structure of PUCCH in an uplink (UL)physical resource block. N_(RB) ^(UL) indicates the number of resourceblocks in UL and n_(PRB) means a physical resource block number. PUCCHis mapped to both side edges of a UL frequency block. CQI resource ismapped to a physical resource block right next to a frequency band edge.And, ACK/NACK may be mapped next to the CQI resource.

In the following description, PUCCH formats are explained in detail.

Prior to the description of PUCCH format 1, PUCCH format 1a and PUCCHformat 1b are described as follows. PUCCH format 1a/1b is a controlchannel used for ACK/NACK transmission.

In PUCCH format 1a/1b, a symbol modulated by BPSK or QPSK modulationscheme may be multiplied by a CAZAC sequence having a length of 12.After completion of the CAZAC sequence multiplication, it is spread withan orthogonal sequence block-wise. Hadamard sequence having a length of4 is used for normal ACK/NACK information. DFT (discrete Fouriertransform) sequence having a length of 3 is used for shortened ACK/NACKinformation and reference signal. Hadamard sequence having a length of 2is used for a reference signal in case of an extended CP.

FIG. 8 shows a structure of ACK/NACK channel in case of a normal CP. Areference signal (RS) is carried on 3 contiguous symbols of a middlepart in 7 OFDM symbols included in one slot and an ACK/NACK signal iscarried on the 4 remaining OFDM symbols. The number and location ofsymbols used for RS may vary in accordance with a control channel andthe number and location of symbols used for an associated ACK/NACKsignal may vary correspondingly. The number of ACK/NACK channelsavailable per resource block may include 12, or 36 in case of a normalCP. The number of ACK/NACK channels available per resource block mayinclude 8 or 12 in case of an extended CP.

When a control signal is transmitted within an allocated band,2-dimensional spreading may be applicable to increase multiplexingcapacity. In particular, both frequency domain spread and time domainspread are simultaneously applied to increment the number of userequipments, which can be multiplexed, or the number of control channels.In order to spread ACK/NACK signal in frequency domain, a frequencydomain sequence may be used as a base sequence. Zadoff-Chu (ZC) sequencecorresponding to one of CAZAC sequences may be used as a frequencydomain sequence. The frequency-domain-spread ACK/NACK signal undergoesIFFT and is then spread in time domain using a time domain sequence. Forinstance, ACK/NACK signal may be spread using an orthogonal sequence(w0, w1, w2, w3) having a length of 4 for 4 symbols. And, RS may bespread through an orthogonal sequence having a length of 3. This may becalled ‘orthogonal covering’.

Examples of sequences used for the spread of ACK/NACK information may beshown in Table 2 and Table 3. Table 2 shows a sequence for a length-4symbol. Table 3 shows a sequence for a length-3 symbol. A sequence for alength-4 symbol may be used for PUCCH format 1/1a/1b of a generalsubframe configuration. In consideration of a case that SRS (soundingreference signal) is transmitted on a last symbol of a 2^(nd) slot in asubframe configuration, a sequence for a length-4 symbol may be appliedto a 1^(st) slot and a shortened PUCCH format 1/1a/1b of a sequence fora length-3 symbol may be applied to a 2^(nd) Slot.

TABLE 2 Sequence Index [w(0), w(1), w(2), w(3)] 0 [+1 +1 +1 +1] 1 [+1 −1+1 −1] 2 [+1 −1 −1 +1]

TABLE 3 Sequence Index [w(0), w(1), w(2)] 0 [1 1 1] 1 [1 e^(j2π/3)e^(j4π/3)] 2 [1 e^(j4π/3) e^(j2π/3)]

Meanwhile, one example of an orthogonal sequence used for a spread of RSof ACK/NACK channel is shown in Table 4.

TABLE 4 Sequence Index Normal CP Extended CP 0 [1 1 1] [1 1] 1 [1e^(j2π/3) e^(j4π/3)] [1 −1] 2 [1 e^(j4π/3) e^(j2π/3)] N/A

FIG. 9 is a diagram of a resource mapping structure in case of applyinga shortened ACK/NACK format. A shortened ACK/NACK format may be used ifboth ACK/NACK and a sounding reference signal (SRS) need to besimultaneously transmitted. And, the shorted ACK/NACK format may be setby an upper layer signaling.

In the following description, PUCCH format 1 is explained. The PUCCHformat 1 is a control channel used for SR transmission.

Scheduling request (SR) is transmitted in a manner that a user equipmentrequests to be scheduled or does not request to be scheduled. SR channelreuses ACK/NACK channel structure in PUCCH format 1a/1b and isconfigured by OOK (on-off keying) scheme based on ACK/NACK channeldesign. A reference signal is not transmitted on SR channel. Hence, asequence having a length of 7 is used for a normal CP. And, a sequencehaving a length of 6 is used for an extended CP. Different cyclic shiftsor orthogonal covers may be applied to SR and ACK/NACK, respectively.

FIG. 10 shows a structure of a channel of a scheduling request in oneslot. Referring to FIG. 10 (a), in case of a normal CP, a sequencehaving a length of 7 is separated into 2 orthogonal sequences (i.e.,sequence 1 and sequence 2). Referring to FIG. 10 (b), in case of anextended CP, a sequence having a length of 6 is separated into 2orthogonal sequences (i.e., sequence 1 and sequence 2).

With reference to FIG. 11, a case of transmitting ACK/NACK informationand SR simultaneously is described as follows. As mentioned in theforegoing description, a user equipment may be able to transmit HARQACK/NACK and SR in a same subframe. For a positive SR transmission, auser equipment transmits HARQ ACK/NACK on a resource allocated for SR.For a negative SR transmission, a user equipment transmits HARQ ACK/NACKon a resource allocated for ACK/NACK.

In the following description, PUCCH format 2/2a/2b is explained. PUCCHformat 2/2a/2b is a control channel to transmit channel measurementfeedback (CQI, PMI, RI).

According to PUCCH format 2/2a/2b, modulation by CAZAC sequence issupported and a QPSK modulated symbol is multiplied by CAZAC sequencehaving a length of 12. A cyclic shift of a sequence may be changedbetween a symbol and a sot. Orthogonal covering is used for a referencesignal (RS).

FIG. 12 is a diagram for a channel structure of CQI information bits.First of all, CQI information bits may include at least one or morefields. For instance, CQI field indicating CQI index to determine MCS,PMI field indicating an index of a precoding matrix in a codebook, RIfield indicating a rank and the like may be included in the CQIinformation bits.

Referring to FIG. 12 (a), a reference signal (RS) is carried on 2SC-FDMA symbols spaced apart from by an interval of 3 SC-FDMA symbols in7 SC-FDMA symbols included in one slot, while CQI information is carriedon the 5 remaining SC-FDMA symbols. Two reference signals (RSs) are usedwithin one slot to support a high-speed user equipment. Each userequipment may be identifiable using a sequence. CQI information symbolsare modulated and delivered to all SC-FDMA symbols. And, SC-FDMA symbolsinclude one sequence. In particular, a user equipment modulates andtransmits CQI with each sequence.

The number of symbols transmittable in one TTI is 10 and modulation ofCQI information is determined up to QPSK. When QPSK mapping is used forSC-FDMA symbol, since 2-bit CQI value may be carried, 10-bit CQI valuemay be carried on one slot. Hence, maximum 20-bit CQI value may becarried on one subframe. In order to spread CQI information, a frequencydomain spread code is used.

CAZAC sequence (e.g., ZC sequence) may be used as a frequency domainspread code. Moreover, another sequence having good correlation propertymay be applied as a frequency domain spread code. In particular, eachcontrol channel may be identifiable in a manner of applying CAZACsequence having a different cyclic shift value. IFFT is performed on thefrequency-domain-spread CQI information.

FIG. 12 (b) shows an example of PUCCH format 2/2a/2b transmission incase of an extended CP. One slot includes 6 SC-FDMA symbols. RS iscarried on one of 6 OFDM symbols of each slot and CQI information bit iscarried on the remaining 5 OFDM symbols. Except this, the former exampleof the case of the normal CP shown in FIG. 12 (a) is exactly applied tothe case of the extended CP.

Orthogonal covering used for the RS shown in FIG. 12 (a) or FIG. 12 (b)is shown in Table 5.

TABLE 5 Normal CP Extended CP [1 1] [1]

Simultaneous transmission of CQI information and ACK/NACK information isdescribed with reference to FIG. 13 as follows.

First of all, in case of a normal CP, it may be able to simultaneouslytransmit CQI information and ACK/NACK information using PUCCH format2a/2b. The ACK/NACK information may be carried on the symbol thatcarries the aforesaid CQI RS shown in FIG. 12. In particular, in case ofthe normal CP, a 2^(nd) RS is modulated into ACK/NACK symbol. In casethat ACK/NACK symbol is modulated by BPSK scheme like PUCCH format 1a,CQI RS is modulated into ACK/NACK symbol by BPSK scheme. In case thatACK/NACK symbol is modulated by QPSK scheme like PUCCH format 1b, CQI RSis modulated into ACK/NACK symbol by QPSK scheme. Meanwhile, in case ofan extended CP, CQI information and ACK/NACK information aresimultaneously transmitted using PUCCH format 2. For this, CQIinformation and ACK/NACK information are joint-coded.

In a backhaul downlink (DL) from a relay node (RN) to a base station(eNB), as mentioned in the foregoing description, uplink (UL) physicallayer (L1) control informations are transmitted. Types of the physicallayer control informations transmitted in the backhaul UL may becategorized into scheduling request (SR), relay node DL channelmeasurement information (corresponding to the previous CQI, PMI or RI)and HARQ ACK/NACK for DL PUSCH transmission.

The above-mentioned control informations, which are transmitted from amacro-UE (e.g., UE receiving a service from a base station in direct) toa base station, are configured in form of a dedicated physical controlchannel [PUCCH format 1(SR), PUCCH format 1a/1b (1/2 bit ACK/NACK),PUCCH format 2 (CQI/PMI/RI), PUCCH format 2a/2b (CQI/PMI/RI+1/2 bitACK/NACK)] and may be transmitted via a physical resource block (PRB)designated at a system band edge position if necessary.

Various embodiments of the present invention explained in the followingdescription are devised in consideration of necessity and transmissionscheme for the above-mentioned UL physical layer control information inbackhaul UL from a relay node to a base station.

In this specification, PDCCH transmitted from a base station to a relaynode (e.g., PDCCH transmitted via a resource region receivable by arelay node in a random DL subframe) may be represented as a relay-PDCCH(R-PDCCH) to be identifiable from PDCCH transmitted to a macro-UE from abase station. Similarly, PUCCH transmitted from a relay node to a basestation may be represented as R-PUCCH.

In the following description, scheduling request, channel measurementinformation and ACK/NACK information are sequentially explained inaccordance with types of UL physical layer control information.

Scheduling Request

In order for a relay node to transmit UL data to a cell base station inbackhaul UL, it may be necessary to consider whether the relay nodeneeds to send a scheduling request message, which is sent to receivedesignations of a resource application, a modulation and coding scheme(MCS) and a transmission mode, to a base station via UL grant PDCCH(physical DL control channel) or R-PDCCH (relay-physical DL controlchannel). Various embodiments in the following description are devisedin consideration of directionality for a resource allocation scheme of acell base station scheduler for a backhaul uplink (UL) and a controlinformation configuration.

1^(st) Embodiment

A 1^(st) embodiment of the present invention relates to a method of notdefining a scheduling request in a relay node backhaul UL.

When relay-UEs are sufficiently present in a random relay node area, itmay be highly probable that data received in access link from therelay-REs to a relay node exist sufficiently and that data to be sent toa base station exist in a UL transmission buffer of the relay node. Atransmission resource allocation (e.g., allocation of transmissionframe) of a relay node backhaul UL may be configured semi-static fromRRC parameters set by an upper layer through a cell-specific RRC (radioresource control) signaling or an RN-specific (or a UE-specific) RRCsignaling. And, a transmission resource of a relay node backhaul UL maybe allocated semi-statically and indirectly or implicitly through acell-specific RRC signaling or a UE-specific RRC signaling set by anupper layer for a relay node backhaul DL.

If this fact is taken into consideration, since a subframe allocationfor a relay node backhaul UL may be configured by RRC parameter, it maybe unnecessary for a relay node to separately send a 1-bit schedulingrequest message to L1/L2 UL scheduler of a cell base station.

In particular, a subframe allocation for a relay node backhaul UL isconfigured semi-static by a cell-specific or relay-specific (orUE-specific) RRC signaling of a cell base station and each relay nodeperforms blind decoding on UL grant PDCCH (or R-PDCCH) in subframebehind ‘A’ subframes from a corresponding subframe for a prescribedsubframe transmission, whereby a presence or non-presence of atransmission in the corresponding subframe, a resource allocation and atransmission mode may be obtained. In particular, a relay node mayoperate by considering that a session has been set without sending ascheduling request message to a base station. In this case, a value of‘A’ is basically set to 4 or may be set to one of 3 to 5. Inconsideration of a status of the subframe allocation for the relay nodebackhaul UL, the base station may be able to send a UL grant in asubframe that meets a reference of the value of ‘A’ to the maximum. Forinstance, a scheme of a relay node backhaul UL transmission by setting avalue of ‘A’ to 4 and a transmission of UL grant PDCCH (or R-PDCCH) forthe relay node backhaul UL transmission or a scheme of a relay nodebackhaul UL transmission by setting a value of ‘A’ to 3 or 5 instead of4 and a transmission of UL grant PDCCH (or R-PDCCH) for the relay nodebackhaul UL transmission may be implemented in a manner of beingselected by an upper layer cell-specific or RN-specific (or UE-specific)RRC signaling.

A relay node may be able to determine a possibility of a transmission ofa subframe set for the relay node itself in accordance with a presenceor non-presence of a detection of UL grant PDCCH (or R-PDCCH). Asmentioned in the foregoing description, a method of using blind decodingof a UL grant may be applicable if a dynamic channel-dependentscheduling is applied in a frequency domain region of a relay nodebackhaul UL.

Meanwhile, as a relay node has stationary or nomadic mobility, a relaynode UL channel may have a very slow variation for a time or an almosttime-invariant property. In this case, a transmission period of SRS forUL channel sounding may be set long. To support this, configurations forthe transmission having a period longer than an SRS transmission perioddefined in the conventional 3GPP LTE system (Release 8 or Release 9) maybe configured by cell-specific or RN-specific (or UE-specific) RRCparameters signaled by an upper layer.

A bandwidth for transmitting SRS may be basically set to a wholebandwidth. Yet, in case that a plurality of transmitting antennas areused, a relatively small SRS bandwidth may be configured to secure PSD(power spectral density) suitable for multiplexing for SRS per antenna(or layer) and channel measurement.

Considering this, in UL grant PDCCH (or R-PDCCH) for applyingchannel-dependent scheduling, since a transmission period is setsuitable for a relay node backhaul UL channel characteristic despiteapplying a transmission function, one UL grant PDCCH (or R-PDCCH) may betransmitted per ‘z’ backhaul UL transmission subframes (or atransmission of a corresponding backhaul UL physical data channel (e.g.,PUSCH or R-PUSCH) in ‘Z’ time domains) for a random relay node [cf. ULgrant PDCCH (or R-PDCCH) is provided for transmission frequency resourceallocation and transmission MCS and transmission mode designation]. Inthis case, ‘Z’ is greater than 1 (Z>1) and may have a considerably largevalue.

Likewise, one DL channel allocation PDCCH (or R-PDCCH) may betransmitted per ‘Y’ backhaul DL transmission subframes (or atransmission of a corresponding backhaul DL physical data channel (e.g.,PUSCH or R-PUSCH) in ‘Y’ time domains) for a random relay node [cf. DLchannel allocation PDCCH (or R-PDCCH) is provided for transmissionfrequency resource allocation and transmission MCS and transmission modedesignation]. In this case, ‘Y’ is greater than 1 (Z>1) and may have aconsiderably large value. Moreover, Y may be equal to or different fromZ.

In case that semi-persistent scheduling (SPS) is applied to a relaybackhaul UL and/or DL data transmission, control information fortransmission frequency resource allocation and transmission MCS andtransmission mode designation may be transmitted in a manner of beingincluded in SPS activation control channel DCI (downlink controlinformation) as a prescribed PDCCH (or R-PDCCH). Moreover, acorresponding control information for cancellation of the transmissionfrequency resource allocation and transmission MCS and transmission modedesignation may be included in SPS cancellation control channel DCIformat. This DCI format may be defined by reusing a previous specificDCI format. And, the above control information may be delivered in amanner of interpreting a specific DCI format by a new scheme (i.e.,original control information bit fields are interpreted in a manner ofbeing designated different as SPS activation control information or SPScancellation control information).

Control information for transmission frequency resource allocation andtransmission MCS and transmission mode designation may be transmitted onPDSCH (or R-PDSCH) in a manner of RN-specific (or UE-specific) RRCsignaling or MAC message. If control information for separatelycanceling the transmission frequency resource allocation and thetransmission MCS and transmission mode designation is defined, thiscontrol information may be transmitted on PDSCH (or R-PDSCH) in a mannerof RN-specific (or UE-specific) RRC signaling or MAC message as well.

A control channel transmission scheme according to a scheduling schemedescribed in this specification may be applicable to a general situationof a relay node backhaul UL and/or a relay node backhaul DL irrespectiveof a presence or non-presence of a transmission of a scheduling request(SR).

Moreover, the following items may be applicable to the 1^(st) embodimentof the present invention and other embodiments of the present inventionexplained in the following description.

For the controlling signaling for a relay node to transmit its bufferstatus to a cell base station scheduler via a periodic UL RRC signalingand to control a session to be initiated or cancelled in aspect ofbackhaul UL radio resource management (RRM), RN-specific (orUE-specific) RRC signaling may be defined. For the control signalingrelated to such an RRC function as a function of controlling a sessionwith a relay node in viewpoint of a cell base station, cell-specific orRN-specific (or UE-specific) RRC signaling may be basically usable.

In order to transmit session initiation/cancellation control informationto a relay node more quickly to prepare for an RRC signaling scheme ofthe session control information, L1/L2 PDCCH (or R-PDCCH) controlsignaling may be taken into consideration. In particular, controlinformation on session initiation and session cancellation may betransmitted by a PDCCH (or R-PDCCH) dedicated scheme of not requestingPDSCH or R-PDSCH decoding subsequent to PDCCH (or R-PDCCH) decoding.Moreover, control information may be signaled via a specific DCI format(e.g., through a reuse and/or new interpretation of some bit fields ofthe specific DCI format). In this case, the control information may betransmitted as PDCCH itself to a relay node or may be used by defining anew DCI format.

On a prescribed PDSCH decoded according to a PDCCH transmission,modification information associated with a transmission of a differenttype may be transmitted as well as the information on the sessioninitiation and cancellation.

2^(nd) Embodiment

2^(nd) embodiment of the present invention relates to a method ofreusing PUCCH format 1 for scheduling request information transmission.

The above-mentioned 1^(st) embodiment considers the following fact.First of all, when a plurality of user equipments are present in a relaynode area, it is highly probable that the relay node may have UL data orcontrol information to transmit via a transmission resource allocated bya cell base station in a prescribed time interval.

According to the 2^(nd) embodiment of the present invention, a functionfor a relay node to make a request for a resource allocation inaccordance with its buffer status is provided not in a situation of theabove-mentioned resource allocation. In particular, as a UL transmissionresource use by a relay node is dynamically scheduled by a cell basestation, a scheme for a macro-UE to make a scheduling request (SR) to abase station may be exactly applicable to a relay node backhaul ULresource allocation scheme. Accordingly, UL resource allocation of PUCCHformat 1 for SR transmission may be configured through RN-specific (orUE-specific) RRC signaling from a cell base station.

Modification of PUCCH Format 1

A method of modifying to use a slot-based PUCCH format 1 is described asfollows.

First of all, for instance, in case of an in-band relay node, if anaccess UL reception of a relay node and a backhaul UL transmission ofthe relay node are performed at the same time, it may cause a problemthat a transmitted signal works as a considerable interference on areceiving stage. Hence, an access link reception and a backhaul linktransmission (or an access link transmission and a backhaul reception)may be multiplexed by TDM (time division multiplexing). In case of sucha half-duplex relay node, a time for a switching between a transmissionfunction and a reception function is taken and a guard time needs to bedefined correspondingly. The guard time may be set to a value of atleast one symbol interval on a subframe or may be occasionally set to atime sample value corresponding to a half of a symbol interval for anoptimized guard time. Moreover, it may be necessary to define a guardtime on a backhaul link subframe in consideration of backwardcompatibility to support a user equipment according to a legacy system.

FIG. 14 is a diagram for backhaul uplink transmission and access uplinkreception operations of a relay node in time domain (by subframe unit).

In case that a relay node switches a backhaul UL transmission functionto an access UL reception function, a guard time may be set at a lastsymbol part 1401/1403 of a backhaul UL. In case that a relay nodeswitches an access UL reception function to a backhaul UL transmissionfunction, a guard time may be set at a first symbol part 1402 of abackhaul UL. In this case, whether to substantially apply a guard timeto a first symbol part or a last symbol part in a random backhaul ULsubframe may be determined in accordance with a relation between abackhaul UL subframe transmission timing and an access UL subframereception timing, i.e., a presence or non-presence of a timing offsetsetting or a setting value. For instance, if a backhaul UL subframetransmission timing is delayed more than an access UL subframe receptiontiming by a half interval of OFDM symbol in a relay node, a guard timemay be set at a first symbol of a backhaul UL subframe. On the contrary,if a backhaul UL subframe transmission timing is set to precede anaccess UL subframe reception timing by a half interval of OFDM symbol ina relay node, a guard time may be designated to a last symbol of abackhaul UL subframe or to a last symbol of an access UL subframe.

In particular, a guard time may be designated to a first part, a lastpart or both of the first part and the last part of a backhaul ULtransmission subframe of a relay node. By considering such adesignation, it may be necessary to modify a channel structure of aconventional PUCCH format in a relay node backhaul link. In particular,regarding channel structures of PUCCH format 1 series, in case of anormal CP, 3 symbols contiguous to each other in the middle of 7 symbolsof one slot may be used for a reference signal (RS) transmission and1^(st), 2^(nd), 6^(th) and 7^(th) symbols may be used for a transmissionof data (e.g., control information). In this case, a guard time is setat each of the 1^(st) symbol and the 7^(th) symbol, whereby the channelstructures of the conventional PUCCH format 1 series may not be exactlyapplied.

Regarding a 2^(nd) slot of one subframe, a channel configuring method ofthe shortened PUCCH format 1/1a/1b has been designed in consideration ofSRS transmission (e.g., SRS transmitted on a last symbol of subframe).Hence, in case that a guard time is set at a last symbol of a 2^(nd)slot of one subframe, it may be able to use the above-mentionedshortened format for the SRS transmission. Considering that thisshortened format is usable cell-specifically, a new channelconfiguration for a relay node operation may not be necessary.Accordingly, in case that there exists at least one relay node having aguard time set at a last part of a subframe in a random cell, ifmacro-UEs transmit scheduling requests as well as a relay node in ULsubframe for which a relay node backhaul UL transmission is set as wellas SRS transmission time, all the macro-UEs may be able to apply amethod of transmitting a shortened PUCCH format 1 in 2^(nd) slot.Alternatively, in case that a guard time is set at a last part of asubframe in at least one relay node, it may be able to configure ashortened PUCCH format 1 to be applied RN-commonly or RN-specifically.In this case, PUCCH frequency resource setting for the applied shortenedPUCCH format 1 may be set identifiable from the frequency resourcesetting for other transmissions of general PUCCH format 1 in viewpointof PRB.

Meanwhile, referring to FIG. 15 (a), in order to enable a base stationto receive SRS at the same timing in consideration of a UL subframetiming alignment and the like, a position of SRS transmission symbol maybe defined differently (e.g., 2^(nd) symbol of a last part). if achanged SRS transmission symbol position and a guard time aresimultaneously taken into consideration, the number of symbol(s) usablefor a data (control information) transmission in one slot may become 2.In particular, referring to a 2^(nd) slot shown in FIG. 15 (a), whenPUCCH format 1 series is applied, in case of a normal CP, 3 contiguoussymbols in the middle of 7 symbols are used for a reference signal (RS)transmission, a guard time may be set at a last symbol, and a symbolright ahead of the last symbol may be usable for an SRS transmission.Hence, 2 symbols of a head part may be usable for a control informationtransmission only. Accordingly, an orthogonal cover (e.g., Walsh cover)having a length of 2 or a cover sequence of a type, in which 2 elementsat a prescribed position of an orthogonal cover having a length of 4 arepunctured, may be applicable.

Meanwhile, regarding a configuration of a 1^(st) slot of one subframe,it may consider a situation that a switching interval is set at a headregion of a subframe. For this, a shortened PUCCH format 1 channelconfiguration of a new type is required. In particular, a cyclic shiftfor a reference signal (RS) and an orthogonal cover are applied in thesame manner of the conventional PUCCH format 1 channel configuration anda channel configuration related to a data (control information)transmission may be modified. In more particular, when an orthogonalsequence for a data transmission is applied, in case that a switchinginterval is set at a first symbol of a subframe, it may be able to applyan orthogonal cover having a length of 3 to start with a 2^(nd) symbol.The orthogonal cover having the length of 3 may use a DFT basedorthogonal cover or a quasi-orthogonal sequence of a type generated frompuncturing a 1^(st) element of an orthogonal cover having a length of 4.This type of the sequence having the length of 3 may be called a simplexcode sequence.

The above-modified PUCCH format 1 may be selectively usable or may beset by a cell-specific or RN-specific (or UE-specific) RRC signaling. Incase of the setting by the cell-specific RRC signaling, theabove-mentioned DFT based orthogonal cover may be applicable. In case ofthe setting by the RN-specific (or UE-specific) RRC signaling, a coverof a simplex code type may be applicable.

Referring to FIG. 15 (b), it may be able to consider a case that aposition of SRS transmission symbol is defined at a random position(e.g., a 1^(st) transmission symbol of a 1^(st) slot) in a 1^(st) slotof a subframe. In this case, the number of data (control information)transmission symbols in a 1^(st) slot of one subframe may become 2 or 3in accordance with a presence or non-presence of a guard timeapplication to a 1^(st) OFDM symbol part of the 1^(st) slot. Inparticular, in case of a normal CP, among 7 symbols configuring oneslot, RS is situated at 3 symbols, a guard interval is situated at aforemost symbol, and SRS is situated at a′ last symbol. Hence, thenumber of symbols usable for a data transmission may become 2 or 3. Incase that the number of data transmission symbols is 2, it may be ableto apply a cover sequence having a type in which 2 elements at aprescribed position in an orthogonal cover (e.g., Walsh cover) having alength of 2 or an orthogonal cover having a length of 3 are punctured.Meanwhile, in case that the number of data transmission symbols is 3, itmay be able to apply a cover sequence having a type in which 1 elementat a prescribed position in an orthogonal cover (e.g., Walsh cover)having a length of 3 or an orthogonal cover having a length of 4 ispunctured.

Like the case that guard times are defined at first and last parts of asubframe, the application of a shortened PUCCH (or R-PUCCH) format of a2^(nd) slot of a subframe and the application of a shortened PUCCH (orR-PUCCH) format of a 1^(st) slot may be synchronized together by an RRCsignaling (cell-specific or RN-specific) configured by an upper layer.In particular, as the PUCCH (or R-PUCCH) applied format of the 1^(st)slot and the PUCCH (or R-PUCCH) applied format of the 2^(nd) slot areidentifiable from each other, a presence or non-presence of aconfiguration may be synchronized by an RRC signaling (cell-specific orRN-specific) configured as a separate parameter by an upper layer.

Moreover, it may be able to consider an additional modification of achannel configuration of PUCCH format 1 in accordance with an SRStransmission scheme or a definition of a guard time on a backhaul ULsubframe as well as a presence or non-presence of an SRS transmission ona relay node backhaul UL. Accordingly, an additional (cell-specific orRN-specific) RRC parameter for a presence or non-presence of formatapplication per additional slot may be defined and applied.

Referring to FIG. 16 (a), in case that a relay node backhaul UL is setin at least 3 contiguous subframes 1601 to 1603, a guard time may not beset at the subframe 1602 except the foremost subframe 1601 and the lastsubframe 1603. For this subframe 1602, PUCCH format defined in theconventional 3GPP LTE system may be intactly usable as PUCCH (orR-PUCCH) format for a scheduling request.

Referring to FIG. 16 (b), in case that a relay node backhaul UL is setin 2 contiguous subframes 1604 and 1605, a guard time may be set at afore transmission symbol part in a former subframe 1604 only and a guardtime may be set at a 1^(st) transmission symbol part of a lattersubframe 1605 only.

In consideration of the above symbol configuration of the relay nodebackhaul UL subframe, the SRS transmission setting configuration and thechannel configuration according to the PUCCH (or R-PUCCH) formatincluding the schedule request (RS) may be set in association with eachother. For instance, using the time-invariant property of a channel of arelay node, SRS may be configured to be only transmitted in subframes[e.g., subframes 1601 and 1602 shown in FIG. 16 (a) or subframe 1604shown in FIG. 16 (b)] in which a guard time (GT) for atransmission/reception function switching function is not set at a lasttransmission symbol part among subframes allocated to a relay nodebackhaul UL.

The above setting may be implemented using RRC parameters that configureSRS transmission period, band, position and the like for a random relaynode. This SRS transmission configuration may be set through UL subframesetting information that is implicitly set by relay node backhaul DLconfiguration information configured by an upper layer through acell-specific or RN-specific RRC signaling. Alternatively, theabove-mentioned SRS transmission configuration may be set in associationwith relay node backhaul UL configuration information configured by anupper layer through a cell-specific or RN-specific RRC signaling.

Meanwhile, in accordance with SRS transmission frame and timingconfiguration set by cell-specific and RN-specific RRC parameters setfor a random relay node, the relay node backhaul DL or UL subframeconfiguration, which is configured by an upper layer, may be set in amanner of being matched in the SRS transmission subframe not to define aguard time (GT) in a relay node backhaul UL subframe.

Regarding PUCCH (or R-PUCCH) formats including scheduling requests,PUCCH (or R-PUCCH) formats of modified types may be usable in accordancewith configurations of guard times (GT) within subframes set for relaynode backhaul UL transmissions. In this case, a relay node and a cellbase station may be able to recognize the configuration of the PUCCH (orR-PUCCH) format for the transmission in advance. Meanwhile, as a guardtime is introduced into a relay node backhaul UL, in order to put alimitation on a use of a specific modified PUCCH (or R-PUCCH) format, atransmission allocation of a relay node backhaul UL subframe may beconfigured to match correspondingly.

Consideration of Relay Node Backhaul UL Transmission SubframeConfiguration

In the following description, when a relay node transmits a schedulingrequest to a base station, a method of considering a configurationstatus of a relay node backhaul UL transmission subframe is explained.

Basically, a UL subframe enabling a random relay node to transmit aprescribed scheduling request may be set among prescribed subframesconfigured for a relay node backhaul UL transmission. In this case, therelay node backhaul UL transmission is configured by a scheme of TDMwith an access UL reception and a UL subframe allocated to the backhaulUL transmission is not set periodically. Hence, since it may bedifficult to periodically set a configuration of a backhaul transmissionsubframe for sending a scheduling request, it may be difficult to putlimitation on a fixed subframe to be allocated for a scheduling requestwith reference to one radio frame of 10 ms. In this case, consideringthat HARQ timing relation between a relay node backhaul DL and a relaynode backhaul UL is designed based on a period of 8 ms, it may be ableto allocate a subframe in a radio frame interval of 40 ms (i.e., theleast common multiple of 10 ms and 8 ms) to a subframe resource for ascheduling request transmission and an RN-specific RRC parameterconfiguration for a channel resource allocation. In particular, inviewpoint of a subframe allocation for a scheduling requesttransmission, it may be able to apply an RRC parameter for the subframeallocation by 10 ms-radio frame unit and/or an RRC parameter for thesubframe allocation within the 40 ms-radio frame interval uniquely oroptionally.

Extension of Scheduling Request

According to the 2^(nd) embodiment and 3^(rd) to 7^(th) embodimentsexplained later in the following description, if a scheduling request isexplicitly transmitted in backhaul UL, a handshaking procedure includinga UL grant PDCCH (or R-PDCCH) or PUCCH (or R-PUCCH) for a buffer statusreporting of a relay node may be performed in continuation with thescheduling request transmission. Yet, this handshaking procedure may puta burden on the relay node due to the above-mentioned backhaul ULsubframe allocation scheme.

To settle such a burden, it may be able to consider a scheme of using ascheduling request to replace a buffer status reporting processperformed separately from the scheduling request or transmit stateinformation in part. For this configuration, it may be able to newlydefine an extended scheduling request information having a size of aplurality of bits instead of a conventional 1-bit scheduling requestinformation.

For instance, after 2-bit scheduling request information has beenconfigured, it may be able to report a buffer status using 3 of 4 statesrepresented as 2 bits except a state of ‘no scheduling request’. Ascheduling request for an audio transmission, a scheduling request for adata transmission or the like may become one example of the bufferstatus.

Alternatively, other information may be included in an extendedscheduling request instead of the buffer status information. Forinstance, such information as backhaul carrier aggregation relatedmeasurement information, channel measurement information of anotherfrequency band failing to covered with SRS within an allocated carrier,CFI setting value in access link, the number of relay-UEs in a relaynode area, a relay node area size and the like may be transmitted in amanner of being included in a scheduling request having an extended bitsize.

Alternatively, an extended scheduling request or a conventional 1-bitscheduling request may be transmitted by being tied with otherinformation. Information transmittable together with a schedulingrequest may include ACK/NACK or CSI (channel status information).Meanwhile, for a transmission of the conventional 1-bit schedulingrequest or the aforesaid extended scheduling request, PUCCH format 1a/1bseries, PUCCH format 2/2a/2b series, a newly defined PUCCH (or R-PUCCH)format described later, or a dedicated physical channel may be usedinstead of PUCCH format 1 based on non-coherent detection.

The PUCCH resource setting for the channel transmission may be set to betransmitted on a resource configured for a scheduling request using aconventional RRC signaling, an implicit ACK/NACK setting resource, anRRC configured ACK/NACK resource or an RRC configured CSI transmissionresource. Details shall be explained later in this specification.

3^(rd) Embodiment

3^(rd) embodiment of the present invention relates to a method ofdefining a new R-PUCCH format for a scheduling request informationtransmission.

By succeeding the aforesaid methods of the upper layer configuration forthe determination of the basic PUCCH channel structure, the transmissiontiming and the transmission scheme according to the 1^(st) embodiment ofthe present invention, control information for modifying a conventional1-bit scheduling request in viewpoint of a relay node backhaul ULtransmission may be applicable to a transmission of a schedulingrequest.

In particular, according to a UL scheduling initiating scheme using aconventional 1-bit scheduling request, a handshaking of controlinformation between a cell base station and a relay node may berequested several times. This may cause considerable latency inaccordance with a situation of a relay node backhaul UL subframeconfiguration.

To solve the above problem of a conventional scheduling requestconfiguration, it may apply the scheme explained in the description ofthe extended scheduling request of the 2^(nd) embodiment. In particular,by extending a bit-width of a scheduling request message to B (B>1), itmay be able to transmit a detailed control information of a bufferstatus information of a corresponding relay node and the like. In thefollowing description, a new PUCCH (or R-PUCCH) channel configurationscheme may be explained to implement a transmission of such an extendedscheduling request.

(1) By intactly applying PUCCH format 1 used for a conventionalscheduling request, it may be able to transmit an increased controlinformation in a manner of extending a symbol space. In order to extenda symbol space, a modulation scheme of a higher order [e.g., n-PSK(phase shift keying) scheme, n-QAM (quadrature amplitude modulation)scheme, etc.] may be used or slot-based information multiplexing (i.e.,method of multiplexing and transmitting control information differentper slot) may be taken into consideration. Accordingly, a newly definedPUCCH (or R-PUCCH) format belongs to PUCCH format 1 series and may bedefined as PUCCH format 1c, PUCCH format 1d or the like.

(2) In order to support an extended bit-width of a scheduling request,it may be able to consider a method of using a conventional PUCCH format2. In particular, a relay node receives allocation of a transportchannel resource through RRC signaling and then transmits controlinformations, which are included in the aforesaid extended schedulingrequest in the allocated transport channel resource, according to PUCCHformat 2. A cell base station is configured to decode the correspondingcontrol information according to the PUCCH format 2.

(3) In order to support an extended bit-width of a scheduling request,it may be able to define a new PUCCH (or R-PUCCH) format X, where X isan index equal to or greater than 3. The newly defined PUCCH format Xfollows a new PUCCH (or R-PUCCH) channel design different from theconventional PUCCH format 1 series or the conventional PUCCH format 2series. According to this scheme, a relay node may be able to receiveallocation of a transport channel resource through RRC signaling. Forinstance, a relay node may be able to receive allocation of a frequencyresource (e.g., prescribed PRB) discriminated from a conventionalchannel for a transmission of a scheduling request. A relay node may beconfigured to transmit control informations included in the aforesaidextended scheduling request according to a newly defined PUCCH format Xon an allocated transport channel resource and a cell base station maybe configured to decode the corresponding control information accordingto the corresponding PUCCH format X.

(4) Without designating PUCCH (or R-PUCCH) format for a transmission ofa scheduling request separately, it may be able to consider a method fora cell base station to explicitly recognize a data to be transmitted inUL from a periodic transmission of a buffer status reporting of a relaynode. Moreover, it may be able to consider a method for having ascheduling request bit included explicitly in control informationscontained in a buffer status reporting of a relay node.

4^(th) Embodiment

4^(th) embodiment of the present invention relates to a method ofdefining RN-specific RRC parameter for an adaptive application betweenthe 1^(st) embodiment and the 2^(nd) embodiment or between the 1^(st)embodiment and the 3^(rd) embodiment.

The 1^(st) embodiment relates to a method of not defining a schedulingrequest, the 2^(nd) embodiment relates to a method of reusing aconventional PUCCH format, and the 3^(rd) embodiments relates to amethod of defining a new PUCCH (or R-PUCCH) format. The efficientapplication of the 1^(st) embodiment and the 2^(nd) (or 3^(rd))embodiment may differ in accordance with a situation of a relay node.For instance, in consideration of a distributed situation of relay-UE ina relay node area and a relay node backhaul traffic situation,efficiency of a UL resource allocation scheduling scheme may differ.Hence, it may be necessary to adaptively apply the 1^(st) embodiment andthe 2^(nd) (or 3^(rd)) embodiment in accordance with a situation.

Accordingly, RN-specific RRC parameter may be designated for theadaptive application of the 1^(st) embodiment and the 2^(nd) (or 3^(rd))embodiment, whereby a scheduling request operation of a relay nodeand/or a backhaul UL scheduling scheme of a cell base station may beselectively configured. To support this configuration, the relay nodemay be able to transmit relevant information and parameters for theadaptive application of a scheduling request method to the cell basestation via a periodic buffer status reporting.

5^(th) Embodiment

5^(th) embodiment of the present invention relates to a method ofperforming a scheduling request on a dedicated physical random accesschannel (PRACH).

The 1^(st) to 4^(th) embodiments mentioned in the foregoing descriptionrelate to a method of transmitting a scheduling request from a relaynode to a backhaul UL set cell base station implicitly/explicitly usinga prescribed L1/L2 dedicated PUCCH (or R-PUCCH) or based on RN-specific(or UE-specific) RRC signaling or methods for excluding a transmissionof such control information. The 5^(th) embodiment of the presentinvention proposes a method of transmitting a scheduling request messageincluding 1 bit or B bits (B>1) using a channel different from PUCCHformat 1. For instance, PRACH may be usable as the different channel.

According to the 5^(th) embodiment of the present invention, bytransmitting PRACH preamble assigned as dedicated to a random relay nodeto a cell base station to match PRACH transmission period configuration,the cell base station may be enabled to allocate a backhaul ULtransmission resource to the corresponding relay node. As the dedicatedPRACH preamble is used, a contention resolution process may beunnecessary for a random access procedure. In this case, a dedicatedPRACH preamble index may be permanently assigned to each relay node withreference to a PRACH preamble set allocated within a cell. Yet, if aPRACH preamble index is permanently assigned in a manner of beingdedicated to each relay node in a cell, it may cause a problem in aspectof overall PRACH preamble capacity of cell base station. Hence, in amanner similar to that of a handover process, it may be able to use amethod of assigning a dedicated PRACH preamble to a random relay nodelimitedly and then collecting the assigned preamble.

For instance, in case that a UL transmission is not performed by arandom relay node for predetermined duration, a dedicated PRACH preambleindex is assigned to the corresponding relay node. After thecorresponding relay node transmits a UL scheduling request using theassigned dedicated PRACH preamble, the used dedicated PRACH preambleindex may be cancelled. In this case, a random one of the formatsdefined in the conventional 3GPP LTE (Release-8 or Release 9) system maybe used as a PRACH preamble format. A preamble format may be intactlyapplicable as defined previously. And, a preamble format of a type, inwhich a length of PRACH preamble is modified in accordance with aconfiguration of a guard time (GT) applied in at least one or more ULsubframes, may be applicable.

6^(th) Embodiment

6^(th) embodiment of the present invention relates to a method oftransmitting an extended scheduling request in a manner of modulatingthe extended scheduling request coherent to a scheduling requestresource. The 6^(th) embodiment of the present invention is associatedwith the method of transmitting the extended scheduling request (i.e.,the B-bit scheduling request) explained in the description of the 2^(nd)and 3^(rd) embodiments.

A conventional scheduling request is transmitted as PUCCH format 1 usinga scheduling request resource. Having received the scheduling request, acell base station non-coherently detects that the scheduling request hasbeen made. In this case, the coherent detection may mean that a channelis detected in a manner of being estimated, compensated, demodulated anddecoded on the basis of a pilot (e.g., a reference signal) of thechannel. And, the non-coherent detection may mean an energy baseddetection scheme without channel estimation with a pilot (e.g., areference signal).

Meanwhile, if a transmission of an incremented number of bits isrequested for an extended scheduling request, it may be able to considera method of transmitting s-bit scheduling request information via Sscheduling request resources (S>1) for a power-non-limited relay node.

Alternatively, if scheduling request information is modulated andtransmitted via a scheduling request resource, it may be able to usePUCCH (or R-PUCCH) format that enables the scheduling requestinformation to be coherently demodulated by a receiving stage (e.g., abase station). Using this PUCCH (or R-PUCCH) format, scheduling requestinformation is transmitted or both scheduling request information andACK/NACK information may be transmitted together. For instance, it maybe able to use PUCCH format 1a, PUCCH format 1b or PUCCH format 2. Usingthe PUCCH format 1a, a 1-bit scheduling request may be transmitted orboth a scheduling request and an ACK/NACK information may be transmittedtogether. Using the PUCCH format 1b, a 2-bit scheduling request may betransmitted or both a scheduling request and an ACK/NACK information maybe transmitted together. Using the PUCCH format 2, a T-bit (T≧1)scheduling request may be transmitted or both a scheduling request andan ACK/NACK information may be transmitted together. Meanwhile, it maybe able to use PUCCH (or R-PUCCH) format that is newly designed for arandom purpose.

7^(th) Embodiment

7^(th) embodiment of the present invention relates to a method oftransmitting a scheduling request of a synch-RACH format.

According to the 5^(th) embodiment mentioned in the foregoingdescription, a relay node uses a dedicated PRACH preamble index assignedby a base station. Yet, according to the 7^(th) embodiment of thepresent invention, a relay node is able to transmit a PRACH preamblerandomly selected from a PRACH preamble set allocated by a cell to whichthe relay node belongs. Following the PRACH preamble transmission(message 1), if a relay node performs a contention resolution processthrough a handshaking of a reception (message 2) of a response to apreamble, a transmission (message 3) of data including its identifiervia UL grant PDCCH (or R-PDCCH) included in the preamble response and aPDCCH reception (message 4) through its identifier, the correspondingrelay node is able to inform a cell base station of the necessity of ascheduling request.

Relay Node Downlink Channel Measurement Information

If a backhaul DL scheduling scheme for a relay node is semi-static orpermanently persistent, assuming that a location of the relay node isfixed, it may be able to obtain a long-term channel feedback. Meanwhile,even if a dynamic channel scheduling is applied to a backhaul DL, arelay node has mobility relatively lower than that of a user equipmentin general. Hence it may be preferable that the relay node obtains along-term channel feedback relative to a channel feedback of the userequipment. Accordingly, a frequency for a relay node to report channelmeasurement information for a backhaul DL to a base station may be setlower than that of a case of a general user equipment. Considering thata backhaul UL transmission subframe allocation is not free in viewpointof a relay node, it may be necessary for a channel measurementinformation reporting frequency to be intentionally maintained low.Thus, the adjustment of the frequency of the channel informationfeedback of the relay node may be configured by an upper layer throughan RRC signaling to the corresponding relay node fro a cell basestation.

This channel measurement information may correspond to the measurementto support a general scheduling on at least one DL component carrier(CC) currently set on a backhaul DL or may include channel measurementinformation for the carrier setting on a base station scheduler or RPMfunction for at least one DL component carrier not set for a backhaul DLtransmission despite being configured by a base station. In this case,the component carrier is related to carrier aggregation and may be ableto provide one large bandwidth by combining a plurality of componentcarriers together.

In case of considering a case that a further advanced channelmeasurement scheme for a backhaul DL is applied, when a UL channel isdetermined to feed back this measurement information, both a symbolspace, which can be provided by the UL channel, and a size of overallchannel measurement feedback information required for carrieraggregation should be taken into consideration.

Moreover, it may be necessary to consider a case that a guard time (GT)for supporting a transmission/reception function switching of a relaynode in a relay node backhaul UL is applied to a fore part and/or a lastpart of a backhaul UL subframe. In this case, a transmission symbolpart, to which a guard time is applied in a 1^(st) slot and/or a 2^(nd)slot of one subframe in a structure of PUCCH format 2 series ispunctured and data (e.g., control information) may be transmitted usingthe rest of transmission symbols. If this modified PUCCH (or R-PUCCH)format structure is applied, an effective coding rate is raised higherrather than a size of channel feedback information. Therefore, channelreliability may be lowered.

In order to extend a symbol space for control information by reinforcingor maintaining channel reliability at a proper level, a new PUCCH (orR-PUCCH) format structure may be designed for channel feedback. Forinstance, in case that a relay node includes a plurality of antennas, aseparate PUCCH resource is allocated to each of the antennas.Subsequently, control information of a larger size is joint-coded bymaintaining an appropriate effective coding rate based on the extendedphysical resources, modulated and then mapped to a physical resource.Meanwhile, a relay node may be able to transmit channel feedbackinformation of a large size in backhaul UL in a manner of multiplexing aplurality of PUCCHs (or R-PUCCHs) for channel feedback on a frequencyresource or a slot and frequency resource (e.g., case of applying aPUCCH transmission scheme using a single slot only).

In order to prevent a situation of excluding prescribed transmissionsymbols in PUCCH format 2 series structure due to the above-mentionedapplication of the guard time in the backhaul UL, as mentioned in theforegoing description of the 2^(nd) embodiment for the schedulingrequest, if backhaul UL transmission subframes contiguous to each otherare configured (e.g., configured by a cell base station schedulerintentionally, configured by an upper layer configuration of backhaul ULsubframe setting), it may be able to adjust a transmission timing totransmit PUCCH (or R-PUCCH) including relay node channel feedbackcontrol information via one subframe having a guard time exist at aportion of the corresponding subframe or subframes having no guard timeexist therein.

Since a relay node backhaul DL link is characterized in that a channelquality is relatively less changeable in accordance time than that of aDL for macro-UE, the necessity to frequently send channel feedbackinformation may be low. Hence, a control of a timing for transmittingchannel feedback information in backhaul UL may be implemented by anevent-triggered method (e.g., a method for a relay node to aperiodicallytransmit channel feedback information transmission PUCCH). Request bitrelated to the event-triggered method may be defined in DCI format of ULgrant PDCCH (or R-PDCCH) of a cell base station for a relay node.Alternatively, channel feedback information may be transmitted in amanner of being piggybacked on PUSCH by the event-triggered method. Inparticular, if there exists channel feedback information to betransmitted, the channel feedback information and data are multiplexedand transmitted on PUSCH.

Meanwhile, considering that HARQ timing relation between a relay nodebackhaul DL and a relay node backhaul UL is designed on the basis of aperiod of 8 ms, channel feedback information of a relay node may betransmitted on PUCCH (or R-PUCCH) or PUSCH (or R-PUSCH) of a long termamounting to an integer (1 included) multiple of 40 ms. If HARQ timingrelation between a relay node backhaul DL and a relay node backhaul ULis designed on the basis of a period of 10 ms, relay node backhaul DLchannel information may be transmitted on PUCCH (or R-PUCCH) or PUSCH(or R-PUSCH) of a long term amounting to an integer (1 included)multiple of 10 ms.

Uplink ACK/NACK for Downlink Data Transmission

In case that ACK/NACK information is transmitted via a PUCCH format1a/1b or a modified PUCCH (or R-PUCCH) format, a structure of PUCCH (orR-PUCCH) may be defined using one of the methods according to the 2nd, 3^(rd) and 4^(th) embodiments of the present invention relating to achannel structure for a scheduling request transmission.

8^(th) Embodiment

8^(th) embodiment of the present invention relates to a method ofreusing PUCCH format 1a/1b for ACK/NACK information transmission andcorresponds to the channel structure for the scheduling requesttransmission according to the 2^(nd) embodiment mentioned in theforegoing description.

UL resource allocation for PUCCH format 1a/1b in relay node backhaul ULmay be implicitly performed using such random information as CCE ofR-PDCCH, other PDSCH resource allocation and the like. Alternatively,considering that R-PDCCH can be designed into a new format, the ULresource allocation may be configured through RN-specific (orUE-specific) RRC signaling from a cell base station. In a situation thata random one of the two resource allocation methods is applied, aphysical resource block, which is a transmission frequency resource ofPUCCH or R-PUCCH for ACK/NACK transmission of a relay node, may beseparately set to be discriminated from PUCCH transmission physicalresource blocks of macro-UEs. The discriminated settings for the PUCCHtransmission physical resource blocks of the relay node and themacro-UEs may be indicated by UE-specific and/or RN-specific RRCsignaling from a base station or implemented in a manner of beingimplicitly discriminated based on a base station scheduling operationfor individual UE-specific RRC signaling, CCE of R-PDCCH or resourceallocation of P-PDSCH.

Modification of PUCCH Format 1a/1b

A guard time (GT) for supporting a transmission/reception function of arelay node may be applied to a fore part and/or a last part of a relaynode backhaul UL transmission subframe [cf. FIG. 14]. In this case,since a channel structure of a conventional PUCCH format 1a/1b is notapplicable as it is, a modification of the channel structure of thePUCCH format 1a/1b is necessary.

For a 2^(nd) slot of one subframe, a method of configuring a channel ofa shortened format has been designed in consideration of SRStransmission. Considering that this method if usable cell-specifically,a separate channel configuration may not be necessary.

Meanwhile, when a position of SRS transmission symbol is defineddifferently in a 2^(nd) slot of one subframe (e.g., 2^(nd) lasttransmission symbol), if a guard time (GT) exists, the number of symbolsusable for a data (control information) transmission becomes 2 [cf. FIG.15 (a)]. Hence, it may be able to apply a cover sequence configured in amanner that 2 elements at prescribed position are punctured for anorthogonal cover (e.g., Walsh cover) having a length of 2 or anorthogonal cover having a length of 4.

For a 1^(st) slot of one subframe, a shortened PUCCH format 1a/1bchannel configuration of a new type is necessary in consideration that aguard time is applied to a fore part of the slot. In particular,although a cyclic shift for a reference signal (RS) and an orthogonalcover configuration method are applicable as it is, an orthogonal covermapping for data (control information) may need to be modified.Considering that a 1^(st) transmission symbol interval of a subframe isexcluded from a transmission due to the application of a guard time, anorthogonal cover having a length of 3 may be applied to the subframe bystarting with a 2^(nd) transmission symbol of a 1^(st) slot of thesubframe. In this case, the orthogonal cover having the length of 3 mayuse a DFT based orthogonal cover or a prescribed quasi-orthogonalsequence (e.g., simplex code sequence) generated from puncturing a1^(st) element for an orthogonal cover having a length of 4.

This selective use of the format may be set by RN-specific (orUE-specific) RRC signaling or cell-specific RRC signaling. In the formercase, it may be able to apply a cover in accordance with a simplex codesequence. In the latter case, it may be able to apply a DFT basedorthogonal cover.

If SRS transmission symbol is defined at a random position in a 1^(st)slot one subframe (e.g., last transmission symbol of the 1^(st) slot),the number of data (control information) transmission symbols of the1^(st) slot becomes 2 [cf. FIG. 15 (b)]. Hence, it may be able to applya cover sequence configured in a manner of puncturing 2 elements at aprescribed position in an orthogonal cover having a length of 2 or anorthogonal cover having a length of 4.

The aforesaid application of a shortened PUCCH format modified for a2^(nd) slot of one subframe and the application of a shortened PUCCHformat for a 1^(st) slot of one subframe may be synchronized together byRRC signaling (cell-specific or RN-specific). Moreover, it may be ableto consider an additional modification of a channel configuration ofPUCCH format 1a/1b according to the definition of the SRS transmissionmethod. For this, an additional RRC parameter (cell-specific orRN-specific) relating to a presence or non-presence of formatapplication per slot may be defined and used.

In case that a relay node backhaul UL subframe is set in at least 3contiguous subframes, there may exist a relay node backhaul UL subframein which a guard time (GT) is not set [cf. FIG. 16 (a)]. In this case,PUCCH (or R-PUCCH) format for ACK/NACK transmission may be able to usePUCCH format defined in the conventional 3GPP LTE (Release 8 or Release9) as it is.

Meanwhile, it may happen that a guard time (GT) is applied to either afirst part or a last part of a subframe [cf. FIG. 16 (b)]. In accordancewith the allocation configuration of the relay node backhaul ULsubframe, the SRS transmission setting configuration and the channelconfiguration of PUCCH (or R-PUCCH) formats for transmission of ACK/NACKinformation may be set by being interconnected to each other. Forinstance, it may be able to set SRS to be only transmitted in subframes,each of which has a guard time (TG) not set at a last transmissionsymbol part, among subframes allocated to a relay node backhaul UL usingthe time-invariant property of a relay node.

In consideration of the above-mentioned symbol configuration of therelay node backhaul UL subframe, the SRS transmission settingconfiguration and the channel configuration according to the PUCCH (orR-PUCCH) format and the scheduling request (RS) can be set in a mannerof being interconnected to each other. For instance, it may be able toset SRS to be only transmitted in subframes (e.g., subframes 1610 and1602 shown in FIG. 16 (a), subframe 1604 shown in FIG. 16 (b)), each ofwhich has a guard time (TG) for a transmission/reception functionswitching not set at a last transmission symbol part, among subframesallocated to a relay node backhaul UL using the time-invariant propertyof a relay node.

The above setting may be implemented using RRC parameters that configureSRS transmission period, band, position and the like for a random relaynode. This SRS transmission configuration may be set through UL subframesetting information that is implicitly set by relay node backhaul DLconfiguration information configured by an upper layer through acell-specific or RN-specific RRC signaling. Alternatively, theabove-mentioned SRS transmission configuration may be set in associationwith relay node backhaul UL configuration information configured by anupper layer through a cell-specific or RN-specific RRC signaling.

Meanwhile, in accordance with SRS transmission frame and timingconfiguration set by cell-specific and RN-specific RRC parameters setfor a random relay node, the relay node backhaul DL or UL subframeconfiguration, which is configured by an upper layer, may be set in amanner of being matched in the SRS transmission subframe not to define aguard time (GT) in a relay node backhaul UL subframe.

Regarding PUCCH formats including ACK/NACK information, PUCCH (orR-PUCCH) formats of modified types may be usable in accordance withconfigurations of guard times (GT) within subframes set for relay nodebackhaul UL transmissions. In this case, a relay node and a cell basestation may be able to recognize the configuration of the PUCCH (orR-PUCCH) format for the transmission in advance. Meanwhile, as a guardtime is introduced into a relay node backhaul UL, in order to put alimitation on a use of a specific modified PUCCH (or R-PUCCH) format, atransmission allocation of a relay node backhaul UL subframe may beconfigured to match correspondingly.

Consideration of Relay Node Backhaul UL Transmission SubframeConfiguration

In the following description, when a relay node transmits ACK/NACKinformation to a base station, a method of considering a configurationstatus of a relay node backhaul UL transmission subframe is explained.

Basically, a UL subframe enabling a random relay node to transmit aprescribed ACK/NACK information may be set among prescribed subframesconfigured for a relay node backhaul UL transmission. Accordingly, ifHARQ timing relation between UL and DL is set to 8 ms, it may bedifficult to periodically set a subframe capable of carrying aprescribed ACK/NACK information. And, it may be difficult to limit thesubframe to a fixed subframe with reference to 10 ms-radio frame.

Therefore, it may be able to consider a subframe allocation within 40ms-radio frame interval to RN-specific RRC parameter configuration forsubframe and channel resource allocation for a scheduling requesttransmission. In particular, in aspect of subframe allocation forACK/NACK information transmission, RRC parameter for subframe allocationby 10 ms-0radio frame unit and/or RRC parameter for subframe allocationwithin 40 ms-radio frame interval may be applicable uniquely orselectively. Meanwhile, if HARQ timing relation between UL and DL is setto 10 ms, a subframe capable of carrying prescribed ACK/NACK informationmay be limited to a fixed subframe within one radio frame. Regarding theRN-specific RRC parameter configuration for this subframe configuration,RRC parameter for subframe allocation by 10 ms-radio frame unit may beapplicable uniquely or selectively.

9^(th) Embodiment

9^(th) embodiment of the present invention relates to a method ofdefining a new R-PUCCH format for ACK/NACK information transmission andcorresponds to the aforesaid channel structure for the schedulingrequest transmission according to the 3^(rd) embodiment.

By succeeding the aforesaid methods of the upper layer configuration forthe determination of the PUCCH channel structure, the transmissiontiming and the transmission scheme according to the 1^(st) embodiment ofthe present invention, control information for modifying a conventional1- or 2-bit ACK/NACK information in viewpoint of a relay node backhaulUL transmission may be applicable.

In particular, a size of ACK/NACK information may need to be increaseddue to carrier aggregation applied to a backhaul DL. Hence, it may beable to consider PUCCH configuration in which a bit-width (e.g.,configured with B bits (B>2)) of ACK/NACK message is extended.

(1) By intactly applying PUCCH format 1a/1b used for a conventional 1-or 2-bit ACK/NACK transmission, it may be able to transmit an increasedcontrol information in a manner of extending a symbol space. In order toextend a symbol space, a modulation scheme of a higher order [e.g.,n-PSK (phase shift keying) scheme, n-QAM (quadrature amplitudemodulation) scheme, etc.] may be used or slot-based informationmultiplexing (i.e., method of multiplexing and transmitting controlinformation different per slot) may be taken into consideration.Accordingly, a newly defined PUCCH (or R-PUCCH) format belongs to PUCCHformat 1 series and may be defined as PUCCH format 1c, PUCCH format 1dor the like.

(2) In order to support an extended bit-width of ACK/NACK information,it may be able to consider a method of using a conventional PUCCH format2. In particular, a relay node receives allocation of a transportchannel resource through RRC signaling and then transmits extendedACK/NACK information via the allocated transport channel resourceaccording to PUCCH format 2. A cell base station is configured to decodethe corresponding control information according to the PUCCH format 2.

(3) In order to support an extended bit-width of ACK/NACK information,it may be able to define a new PUCCH (or R-PUCCH) format X, where X isan index equal to or greater than 3. The newly defined PUCCH format Xfollows a new PUCCH (or R-PUCCH) channel design different from theconventional PUCCH format 1 series or the conventional PUCCH format 2series. According to this scheme, a relay node may be able to receiveallocation of a transport channel resource through RRC signaling. Forinstance, a relay node may be able to receive allocation of a frequencyresource (e.g., prescribed PRB) discriminated from a conventionalchannel for a transmission of ACK/NACK information. A relay node may beconfigured to transmit extended ACK/NACK information according to anewly defined PUCCH format X on the allocated transport channel resourceand a cell base station may be configured to decode the correspondingcontrol information according to the corresponding PUCCH format X.

(4) Without designating PUCCH (or R-PUCCH) format for a transmission ofACK/NACK information separately, it may be able to transmit ACK/NACKinformation using PUSCH (or R-PUSCH) by a periodic or event-triggeredmethod. FIG. 17 is a diagram for a structure of mapping ACK/NACK.CQI/PMI, RI and data to a resource on PUSCH in the conventional 3GPP LTE(Release 8 or Release 9) system. According to the present invention, inorder to map extended ACK/NACK information to a resource on PUSCH (orACK/NACK multiplexing), it may be able to use a method of mappingACK/NACK to a resource on PUSCH in the same manner of the definition inthe conventional 3GPP LTE system. Alternatively, it may be able to mapextended ACK/NACK information to a resource on PUSCH using a method oftransmitting CQI/PMI information on PUSCH defined in the conventional3GPP LTE system. In this case, the extended ACK/NACK information may betransmitted in a manner of being mapped to PUSCH (or R-PUSCH) allocatedresource of a subframe from a first part or a last part in order by atime-first mapping method.

When the extended ACK/NACK information is transmitted by being mapped toPUSCH (or R-PUSCH) resource by the method described with reference toFIG. 17, it may be necessary to consider a case that a switchinginterval (or a guard time (GT) is applied to a backhaul UL subframetransmitted by a relay node. In the switching interval applied backhaulUL subframe, the extended ACK/NACK information may be mapped to the restof physical resources except the physical resource of a transmissionsymbol to which the switching interval is applied.

10^(th) Embodiment

10^(th) embodiment of the present invention relates to a method ofdefining RN-specific RRC parameter for adaptive application between theeth and 9^(th) embodiments for the ACK/NACK information transmission andcorresponds to the aforesaid 4^(th) embodiment relating to the channelstructure for the scheduling request transmission.

Efficiency of the 8^(th) or 9^(th) embodiment may vary in accordancewith a situation of a relay node. Hence, it may be able to designateRN-specific RRC parameter to adaptively apply the 8^(th) or 9^(th)embodiment in accordance with a corresponding situation. And, it may beable to correspondingly configure an ACK/NACK information transmittingoperation of a relay node an/or a backhaul UL scheduling scheme of acell base station selectively.

As mentioned in the foregoing descriptions of the 2^(nd) and 3^(rd)embodiments, if a size of ACK/NACK information becomes greater than 2bits due to the application of carrier aggregation in relay nodebackhaul DL, it may be able to transmit extended ACK/NACK information byapplying PUCCH format different from PUCCH format 1a/1b used for theACK/NACK information transmission. In case that a relay node includes aplurality of antennas, a separate PUCCH (or R-PUCCH) resource isallocated to each of the antennas and the whole ACK/NACK information maybe transmitted in a manner of configuring PUCCH (or R-PUCCH)individually by dividing the whole PUCCH (or R-PUCCH) by a unit ofindividual antenna unit based on the extended physical resources. Apower-non-limited relay node may be able to transmit a plurality ofPUCCHs (or R-PUCCHs) simultaneously by using the structure of PUCCHformat 1a/1b intact. In case that ACK/NACK information is transmitted bybeing mapped to a resource on PUSCH, it may be able to apply aprescribed block coding scheme, a convolutional tail-biting codingscheme or the like to provide an effective coding rate enough for a sizeof extended ACK/NACK information, which is different from a method oftransmitting ACK/NACK information by mapping it to symbols adjacent to ademodulated reference signal (DM RS) only if there is PUCCH (orR-PUCCH), as defined in the conventional 3GPP LTE (Release 8 or Release9) system.

In the following description, items taken into consideration in commonto the above-mentioned embodiments of the present invention areexplained.

According to the present invention, in case that PUCCH for specificcontrol information (e.g., scheduling request, relay node channelfeedback information, etc.), in which a transmission timing and atransmission resource are configured by a prescribed upper layer (RRC)signaling, is configured, it may be able to set PUCCH (or R-PUCCH)transmission subframe synthetically in consideration of a backhaul ULtransmission subframe allocation pattern (configured by an upper layer(RRC) as well). In this case, since the allocation of a backhaul ULtransmission subframe is configured in accordance with HARQ timing, atransmission period of control information transmitted on PUCCH (orR-PUCCH) may be defined as HARQ timing or a multiple of the HARQ timing.For instance, in case that relay node backhaul DL and/or UL HARQ timingrelation is set on the basis of 8 ms, a transmission period of controlinformation transmitted via PUCCH (or R-PUCCH) may be defined as aninteger (e.g., 1 included) multiple of 40 ms. For another instance, incase that relay node backhaul DL and/or UL HARQ timing relation is seton the basis of 10 ms, a transmission period of control informationtransmitted via PUCCH (or R-PUCCH) may be defined as an integer (e.g., 1included) multiple of 10 ms.

Meanwhile, it may be able to modify a transmission structure of a symbolunit of PUCCH in accordance with a guard time (GT) set for a relay nodebackhaul UL transmission subframe. In order to minimize suchmodification, a following method may be applicable. Referring to FIG. 16(c), when at least one relay node backhaul UL transmission subframeallocation is contiguously performed [e.g., 2nd and 3rd subframes shownin FIG. 16 (c)], a slot, for which a guard time (GT) is not set, is a2^(nd) slot 1606 of a former subframe or a 1^(st) slot 1607 of a lattersubframe. Thus, using the guard time (GT) unset slots 1606 and 1607, itmay be able to transmit PUCCH for a scheduling request, a relay nodebackhaul DL channel feedback and ACK/NACK control information on DLtransmission. In this case, PUCCH channel structure per slot may adopt astructure that does not consider a transmission symbol puncturing inaccordance with a guard time. For instance, it may be able to applyPUCCH format 1 defined by the conventional 3GPP LTE (Release 8 orRelease 9) for a scheduling request. In may be able to apply PUCCHformat 1a/1b for ACK/NACK transmission for DL transmission. And, it maybe able to apply PUCCH format 2/2a/2b for a DL channel feedback.

Meanwhile, in case of transmitting relay node backhaul UL controlinformation using a resource of PUSCH, it may be able to consider a casethat at least one or more backhaul UL transmission subframes arecontiguously allocated. In this case, a subframe to carry acorresponding PUSCH may be uniquely set in accordance with a physicalresource mapping method of control information transmission symbolwithin the PUSCH.

For instance, referring to FIG. 17, ACK/NACK information may be mappedin a manner of puncturing data transmission symbols adjacent todemodulated reference signal (DM-RS) transmission symbol (e.g., 4^(th)symbol position in each slot). Rank indicator (RI) information may bemapped to transmission symbols adjacent to ACK/NACK transmission symbolin a slot boundary direction. The RI information may be defined ascontrol information for determining a size of whole feedback informationin case of a channel feedback in 3GPP LTE-A system. When PUSCH isconfigured by the above-mentioned mapping method, assume a case that 2relay node backhaul UL subframes are contiguously allocated [e.g.,subframes 1604 and 1605 shown in FIG. 16 (b)]. In this case, it may beable to transmit PUSCH having control informations mapped thereto usinga subframe having a guard time (GT) not set at its fore part (e.g.,subframe 1605 shown in FIG. 16 (b)). This may consider a fact thatchannel feedback information is mapped by starting with a 1^(st)transmission symbol of a slot in case of an extended CP.

A guard time (GT) set at a last transmission symbol part of a subframemay collide with SRS transmission symbol position defined in theconventional 3GPP LTE (Release 8 or Release 9) system. In considerationof the collision, if 2 relay node backhaul UL subframes are contiguouslyallocated [e.g., subframes 1604 and 1605 shown in FIG. 16 (b)], it maybe able to transmit PUSCH having control informations mapped theretousing a subframe having a guard time (GT) not set at its last symbolpart (e.g., subframe 1604 shown in FIG. 16 (b)).

As mentioned in the foregoing description of the embodiments, if a PUCCHchannel structure, in which PUCCH formats (PUCCH format 1/1a/1b/2/2a/2b)defined by the conventional 3GPP LTE system) are modified inconsideration of a guard time (GT) on a relay node backhaul UL subframeand a physical signal (e.g., SRS, etc.), is applied, it may be able toapply the modified PUCCH channel structure to a separate physicalresource block (PRB) discriminated from a resource for PUCCH defined inthe conventional 3GPP LTE system.

Meanwhile, if it is difficult to design R-PUCCH due to a presence of aguard time (GT) in a relay node backhaul UL and the like or channelinformation to be transmitted requires a code resource space larger thana symbol space provided by PUCCH, the R-PUCCH may not be defined in abackhaul UL. Instead, relay node backhaul feedback informations of alltypes may be fed back to a base station via PUSCH. In doing so, controlinformation may be transmitted on PUSCH only or various kinds of controlinformations and data are transmitted on PUSCH by being multiplexedtogether. Thus, in a method of transmitting control information onPUSCH, it may be able to use aperiodic PUSCH (or R-PUSCH) of theconventional 3GPP LTE (Release 8 or Release 9) system or PUSCH (orR-PUSCH) of a type periodically configured by an upper layer. Moreover,the present invention is non-limited by the above-mentioned exemplarydescription and may apply to new multiplexing schemes for feedbackinformations requested by a relay node backhaul UL of a new type.

FIG. 18 is a diagram of a wireless communication system including arelay node 1800, a base station device 1860 and a user equipment device1870 according to one preferred embodiment of the present invention.

A base station needs to be equipped with a DL transmission function anda UL reception function only and a user equipment needs to be equippedwith a DL reception function and a UL transmission function only. Yet, arelay node needs to perform a function of a backhaul DL reception fromthe base station, a function of a backhaul UL transmission to the basestation, a function of an access UL reception from the user equipmentand a function of an access DL transmission to the user equipment all.Therefore, the relay node may be able to include a receiving module 1810and a transmitting module 1820. The receiving module 1810 may include a1^(st) receiving module configured to receive a backhaul DL from thebase station and a 2^(nd) receiving module configured to receive anaccess UL from the user equipment. The transmitting module 1820 mayinclude a 1^(st) transmitting module configured to transmit a backhaulUL to the base station and a 2^(nd) transmitting module configured totransmit an access DL to the user equipment. And, the relay node may beable to include a processor 1830. The processor 1830 is connected withthe receiving module 1810 and the transmitting module 1820 to controlthe receiving module 1810 and the transmitting module 1820. And, theprocessor 1830 is connected with the rest of the components including amemory 1840 and the like of the relay node and may be able to controloverall operations of the relay node including the components. Anantenna 1850 of the relay node may include a single antenna or aplurality of antennas. If the relay node includes a plurality of theantennas, it may be provided to support MIMO system.

The relay node according to one embodiment of the present invention maybe able to transmit backhaul UL control information to the base station.In this case, the backhaul UL control information may include at leastone of a scheduling request, backhaul DL channel measurement informationand ACK/NACK for a DL data transmission.

For the transmission of the backhaul UL control information, theprocessor 1830 may include a determining module 1831, a spreading module1832 and a mapping module 1833. The determining module 1831 is able todetermine whether a guard time (GT) is set for one time slot of abackhaul UL subframe transmitted via the 1^(st) transmitting module.Hence, a guard time set slot including a transmission symbol may bedetermined as a 1^(st) type slot or a slot failing to have a guard timeset may be determined as a 2^(nd) type slot. In accordance with adetermination result by the determining module 1831, a differentsequence may be applied to a spreading of backhaul UL controlinformation. In particular, the spreading module 1832 may be able tospread the backhaul UL control information in time domain using asequence (e.g., an orthogonal sequence having a length of 3) having a1^(st) length for the 1^(st) type slot having the guard time (GT) settherefor. And, the spreading module 1832 may be able to spread thebackhaul UL control information using a sequence (e.g., an orthogonalsequence having a length of 4) having a 2^(nd) length for the 2^(nd)type slot having the guard time (GT) not set therefor. The mappingmodule 1833 may be able to map the backhaul UL control informationspread by the spreading module 1832 to a transmission symbol of aprescribed slot. And, the processor 1830 may be able to control abackhaul UL subframe, which includes at least one of the backhaul ULcontrol information mapped 1^(st) type slot and the backhaul UL controlinformation mapped 2^(nd) type slot, to be transmitted to the basestation.

For instance, in case of a normal CP, one slot includes 7 transmissionsymbols and 3 contiguous symbols in the middle of the 7 transmissionsymbols are used for a reference signal (RS) transmission. Hence,backhaul UL control information may be basically spread and mapped tothe remaining 4 transmission symbols using a sequence having a length of4. In case that a guard time is set for one slot, a modified spreadingand mapping operation may be performed. In particular, the processor1830 may be able to generate a sequence having a 1^(st) length (e.g., anorthogonal sequence having a length of 3) by puncturing sequenceelement(s) (e.g., one sequence element) corresponding to the number ofthe guard time set transmission symbols in a sequence having a 2^(nd)length (e.g., an orthogonal sequence having a length of 4).

It may be able to consider a case that a symbol for a sounding referencesignal (SRS) transmission is additionally included in one slot. In thiscase, a shortened PUCCH format 1 may be usable for a slot having noguard time set therefor (e.g., 2^(nd) type slot). Yet, in a guard timeset slot (e.g., 2^(nd) type slot), spreading and mapping of the backhaulUL control information may be performed using a modified sequence inaddition. In particular, the determining module may be furtherconfigured to determine whether one time slot in a backhaul UL subframeincludes a sounding reference signal (SRS) transmission symbol. Hence,if the time slot includes the sounding reference signal transmissionsymbol, the processor 1830 may be able to further puncture sequenceelement(s) (e.g., one sequence element) corresponding to the number ofsounding reference signal transmission symbols in a sequence of a 1^(st)length (e.g., a sequence having a length of 3) and a sequence of a2^(nd) length (e.g., a sequence having a length of 4). Accordingly, if asymbol for a sounding reference signal is transmitted in one guard timeset slot, a sequence having a length of 2 may be used. If a symbol for asounding reference signal is transmitted in one slot having no guardtime set therefor, a sequence having a length of 3 may be used.

In case that a bit-width is increased to send additional controlinformation in accordance with extension of backhaul UL controlinformation, it may be able to consider a case that a conventional PUCCHconfiguration is unable to carry the increased control information. Inthis case, the processor 1830 may be able to support the increasedbit-width by modulating the backhaul UL control information using one ofa phase and an amplitude or by multiplexing the backhaul UL controlinformation on the basis of a slot.

In order to determine a timing of transmitting backhaul UL controlinformation, the processor 1830 may be able to control the backhaul ULcontrol information to be transmitted by a transmission period based onHARQ (hybrid automatic repeat request) timing of backhaul UL andbackhaul DL. In particular, the processor 1830 may be able to allocate asubframe for transmitting the backhaul UL control information by a radioframe unit amounting to an integer (1 included) multiple of 10 ms or 40ms via RRC parameter from the base station.

The processor 1830 performs a function of operating information receivedfrom the base station and/or the user equipment, information to transmitto the base station and/or the user equipment and the like. The memory1840 may be able to store the operated information and the like forprescribed duration and may be substituted with such a component as abuffer (not shown in the drawing) and the like.

Embodiments of the present invention can be implemented using variousmeans. For instance, embodiments of the present invention can beimplemented using hardware, firmware, software and/or any combinationsthereof.

In the implementation by hardware, a method according to each embodimentof the present invention can be implemented by at least one selectedfrom the group consisting of ASICs (application specific integratedcircuits), DSPs (digital signal processors), DSPDs (digital signalprocessing devices), PLDs (programmable logic devices), FPGAs (fieldprogrammable gate arrays), processor, controller, microcontroller,microprocessor and the like.

In case of the implementation by firmware or software, a methodaccording to each embodiment of the present invention can be implementedby modules, procedures, and/or functions for performing theabove-explained functions or operations. Software code is stored in amemory unit and is then drivable by a processor. The memory unit isprovided within or outside the processor to exchange data with theprocessor through the various means known to the public.

As mentioned in the foregoing description, the detailed descriptions forthe preferred embodiments of the present invention are provided to beimplemented by those skilled in the art. While the present invention hasbeen described and illustrated herein with reference to the preferredembodiments thereof, it will be apparent to those skilled in the artthat various modifications and variations can be made therein withoutdeparting from the spirit and scope of the invention. Thus, it isintended that the present invention covers the modifications andvariations of this invention that come within the scope of the appendedclaims and their equivalents. For instance, the respectiveconfigurations disclosed in the aforesaid embodiments of the presentinvention can be used by those skilled in the art in a manner of beingcombined with one another. Therefore, the present invention isnon-limited by the embodiments disclosed herein but intends to give abroadest scope matching the principles and new features disclosedherein.

While the present invention has been described and illustrated hereinwith reference to the preferred embodiments thereof, it will be apparentto those skilled in the art that various modifications and variationscan be made therein without departing from the spirit and scope of theinvention. Thus, it is intended that the present invention covers themodifications and variations of this invention that come within thescope of the appended claims and their equivalents. And, it isapparently understandable that an embodiment is configured by combiningclaims failing to have relation of explicit citation in the appendedclaims together or can be included as new claims by amendment afterfiling an application.

INDUSTRIAL APPLICABILITY

A method and apparatus for transmitting control information in a relaynode backhaul uplink according to various embodiments of the presentinvention may be available for a mobile communication system including arelay node or wireless communication industry.

What is claimed is:
 1. A method for transmitting uplink controlinformation by a relay node, the method comprising: receiving, at therelay node from a base station, a downlink data; and transmitting, fromthe relay node to the base station, a hybrid automatic repeat request(HARQ)-acknowledgment for the downlink data using a physical uplinkcontrol channel (PUCCH), wherein an allocated PUCCH resource used by therelay node to transmit the HARQ-acknowledgment to the base station isconfigured by a higher layer signaling, wherein the relay node isconfigured with a plurality of antennas, and uses separate PUCCHresources allocated to each of the antennas, wherein theHARQ-acknowledgment is transmitted on the plurality of antennas, andwherein the PUCCH resource for each of the plurality of the antennas isconfigured by the higher layer signaling.
 2. The method according toclaim 1, wherein the HARQ-acknowledgment is transmitted using PUCCHformat 1a or 1b.
 3. The method according to claim 1, wherein the higherlayer signaling is radio resource control (RRC) signaling.
 4. The methodaccording to claim 1, wherein the downlink data is received on aphysical downlink shared channel (PDSCH).
 5. The method according toclaim 4, wherein the PDSCH is indicated by a relay-physical downlinkcontrol channel (R-PDCCH).
 6. A relay node for transmitting uplinkcontrol information, the relay node comprising: a receiving module forreceiving downlink control information and data from a base station; atransmitting module for transmitting the uplink control information anddata to the base station; a plurality of antennas connected with thetransmitting module; and a processor connected with the receiving moduleand transmitting module, the processor controlling the relay nodeincluding the receiving module and the transmitting module, wherein theprocessor is configured to: receive, using the receiving module, adownlink data; and transmit, using the transmitting module, a hybridautomatic repeat request (HARQ)-acknowledgment for the downlink datausing a physical uplink control channel (PUCCH), wherein an allocatedPUCCH resource used by the relay node to transmit theHARQ-acknowledgment to the base station is configured by a higher layersignaling, wherein the relay node uses separate PUCCH resourcesallocated to each of the antennas, wherein the HARQ-acknowledgment istransmitted on the plurality of antennas, and wherein the PUCCH resourcefor each of the plurality of the antennas is configured by the higherlayer signaling.